Bristol Motor Speedway - Day 1

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Mark Martin, driver of the Bass Pro Shops / Mobil 1 Chevrolet,... NyhetsfotoBil,Bristol Motor Speedway,Förare,Hjälm,Horisontell,Huvudbonad,Mark Martin,Motorsport,Nascar Sprint Cup,Rätta till,Sport,Sporthjälm,Stock Car Racing,Tennessee,Träna,USAPhotographer Collection: NASCAR 2013 NASCARBRISTOL, TN - AUGUST 23: Mark Martin, driver of the #14 Bass Pro Shops / Mobil 1 Chevrolet, adjusts his helmet in his car during practice for the NASCAR Sprint Cup Series IRWIN Tools Night Race at Bristol Motor Speedway on August 23, 2013 in Bristol, Tennessee. (Photo by John Harrelson/NASCAR via Getty Images)